Please tell me where to look, thank you :)

I'm a noob at messing with Android tablets and phones and rooting them and such. What I'm trying to find is a way to see a timestamp for Instagram photos, videos, and comments.
I've seen a few apps mentioned around but I can't get them installed.
I'm using an Acer Iconia B1-710.
Please tell me where to look for more reliable info on this.

Thank you!