Myself

Hello
My name is yoland, I am a chinese girl.
I have learned English for several years long time ago,but now I forget almost all of them.Would you love to help me?

Hello
My name is Yoland, and I am a Chinese girl.
I studied English for several years a long time ago, but now I forget almost all of it. Would you like to help me?

'Studied' (plural for study) is a better word than 'learned' for this sentence. 'Studied' implies ongoing learning, like studying English in school. To say that you 'learned' English in school would also be correct, but 'studied' makes more sense. This link explains the difference well:
http://www.abaenglish.com/blog/english-vocabulary-learn-english-with-aba/what-is-the-difference-between-learn-and-study/

'Have' is past tense, but you would not use it in this sentence, because 'a long time ago' is past tense. You do not need to say both. If you said "I have studied English for several years" that would be gramatically correct, but not true. Saying that would imply that you have continuously studied English for several years and have not stopped.

You need to include 'a' when you say 'a long time.'

Using 'I forget' in this way is technically gramatically incorrect, but is very, very commonly used in this way.  Probably more common than the gramatically correct way, which is 'I have forgotten.'  I think this is because it is just quicker and easier to say.  Personally, I would say that both are correct.  You could also say, "I forgot most of it."

Instead of 'them' you should use 'it.' 'It' would be referring to one thing, and 'them' would be referring to many things.  Since you are referring to the English language, you would say 'it.'  If you said "I learned many English words," then you would say "I forgot most of them."

The word 'love' is not appropriate here.  Use 'like' instead.  You would never ask someone to love something, it is only offered.  For example, you could ask "Would you like to help me?" and I could reply "Yes, I would love to help you!" or "Yes, I would like to help you."  Using 'love' in this way implies enthusiasm, which is not decided by the person asking the question.

I hope this helps!! :)

Myself

Hello
My name is yoland, I am a chinese girl.
I have learned English for several years a long time ago,but now I forgot almost all of them.Would you love to help me?

Hello ! I'm not a native english speaker, but i could help you if you want

Myself

Hello
My name is Yoland and I am a Chinese girl.
I have studied English for several years a long time ago, but I have forgotten almost all of it. Would you love to help me?

Myself

Hello,
My name is Yoland, and I am a Chinese girl.
A long time ago, I learned English over several years, but now I have forgotten almost all of it. Would you like to help me?

Myself

Hello
My name is Yoland, I am a chinese girl.
Several years ago I was learning English, but now I forget almost all of it. Would you like to help me learn it?