Question

​to add notes or comments, insert a comment tag using the syntax _____.

Answer 1

The needed syntax would be:
<!--comment-->
Hope I could be of assistance! ;)

Answer 2

<!--type your comment-->

Procedure:

First, add an arrow pointing left.

Second, next to the arrow, add an exclamation mark

Third, next to the exclamation mark, add two dashes . Please not that if you get the dashes wrong it will not display properly.

Then, add your comment

Lastly, close with 2 dashes with an arrow pointed right.