Part 3:

Thus, it is our aim to realize the escolhas realizacionais, structuring and arrangement of lexical items and sentences that hide frauds, sustain bluffing and attract readers and investor’s attention by convincing them to risk their own capital into shares little or nothing promising . 

Thus, it is our aim to realize the “escolhas realizacionais” — theoretical perspective that combines assumptions — structuring and arrangement of lexical items and sentences that hide frauds, sustain bluffing and attract readers and investor’s attention by convincing them to risk their own capital into shares into shares promising little or nothing.

“escolhas realizacionais” — This is a uniquely Portuguese term and you should put quotations around it and then give its meaning for English readers.

Part 1 — The site is not responding well. I've had to rewrite and submit this three times and so I will break this up into parts; sorry.

Red = important correction. Blue = my suggestion

If you can... Try it! :-) It´s my research! It´s important texto to me. Thank you a lot!
It’s an important text to me. / This text is important to me.

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This study is a result and part of the thesis in progress in which the research objects are news and trades, market oficial communications, that add social practices common to the universe of brazilian financial market, ie: transactions, purchase and sale of securities the BM & FBovespa SA.

This study is a result and part a thesis in progress in which the research objects are news and trades, and official marketing communications that are adding [new] social practices commonly being used in the universe of Brazilian financial marketing, i.e., transactions, purchases and sales of BM & FBovespa SA securities.

This study is part of a thesis in progress in which the research objects are news, trades, and official marketing communications that are creating new social practices being adopted in Brazilian financial marketing, i.e., transactions, purchases and sales of BM & FBovespa SA securities.

"transactions, purchase and sale..." : If one in the series is plural, they should all be plural; if one is singular, then they should all be singular.

Part 5:

In these, we [?] emphasize, respectively, the formation of the sentence and textual metafunctions, interpersonal and ideational; semiotic modes that support the dissimulation and even representations, styles and suggested identities in discourse. Among the topics discussed include: information media as a product of non-durable consumer, the process of empowerment and hierarchies between the producer and the consumer of the news, the forms of social hiding agent information, ethics and journalistic praxis. 

“We emphasize...”: Who is the “we”?

Part 4:

The theoretical assumptions underpinning this work are Critical Discourse Analysis by Norman Fairclough, studies grammar of Michael Halliday and Christian Matthiessen and Social Semiotics Hodge and Kress. 

The theoretical assumptions underpinning this work are cited in Critical Discourse Analysis by Norman Fairclough, An Introduction to Functional Grammar by Michael Halliday and Christian Matthiessen, and Social Semiotics by Hodge and Kress.

Part 6:

Among the topics discussed include: information media as a product of non-durable consumer, the process of empowerment and hierarchies between the producer and the consumer of the news, the forms of social hiding agent information, ethics and journalistic praxis.

Among the topics discussed include: information media as a product of non-durable consumer [products/goods], the process of empowerment and hierarchies between the producer and the consumer of the news, the forms of social hiding agent information, ethics and journalistic praxis. 

You've done a very fine job! Congratulations! This is really good work!