Hi Adela! I see you already have one very good correction. Here is an alternate version:

One sentence every day!

One Sentence Every Day! (Note: In English, we capitalize the words in a title, except for "the" and "a".

I am new in Italki, I want to write a sentence every day, but yesterday I didn't .

I am new to iTalki. I want to write a sentence every day, but yesterday I didn't. (Note: the first comma should be a period. I noticed Rive has the same problem. It must be a difference between English and Spanish.)

I need to write from my computer at home, because I can not get into Facebook at work.

I need to write from my computer at home because I am not allowed to sign into Facebook at work.

Today my phrase is here.

These are my phrases for today.

Very nice!!!

One Sentence every Each Day!

I am new here at in Italki. I want to write a sentence every each day, but yesterday I didn't . I need to write from my home computer at home, because I can not cannot get into Facebook at work. Today my phrase is here. Here are my sentences today.