Why did I join italki? (Or "The reason I joined Italki")

After using this website （software/website/platform Which word is better?）I found that this is a good learning platform. So I think I will write about that.The learning atmosphere of this website is better than I expected. I like it so much.
How did I found this website? 
One day...I really miss someone, so I searched his name online. (I don't understand this part) I found this software and I registered. I had no intention of writing in the beginning...But the software keeps sending emails to my mailbox. Although I know this website sends email automatically. I was touched. So I started writing my first essay.（essay/ composition/a letter；Which should I use?）and try to talk to other. ( communicate with others ...I am not sure which one is  better) (They both work!)

This is really a good website. I think I'd like to thank the person who let me find the software.He has always been a good influence for me. I miss him very much but I can not contact him...   Or too much miss a person is a bother (I am not sure about this one either), but I can't control myself. I'm sorry about that. I am so sad. What should I do..?

It's a good start! Be more careful about typographical error next time!