My friend Mei found this nice app wow！. Wow! It can help fixus edit our journals more easier ly haha. My friend Mei found this nice app. Wow! It can help us edit our journals more easily haha.

Anyway, we're going to have fun in there! Anyway, we're going to have fun here!

The way this is worded sounds like you are telling someone else to have fun. Since you used "our" in a previous sentence I am matching the 2nd person plural