Can you tell me what is this?

[r_f_riyad_]

I don't know how to add this and why.

[mariashtelle1]

4 minutes ago, r_f_riyad_ said:

don't know how to add this and why.

I mean they literally explained it on the screenshot:

how to add it: just click on the thing that says “click here” 

and why: so you and your client can leave comments on a picture 🤷‍♀️ 

[mbamunna]

click on a attached picture in which area you want to mention something. After click on a area you can type your comment there.