CMS Made Simple Forums

Hi.
I use simplex template and I footer I have seen Twitter, Facebook etc. I would like to add a link to Instagram (I can modify the Twitter link for example) but I can't find where the Icons are (or the code for them)?
Can anyone point me I the right direction?
I use CMS 2.2.7
Br
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Those icons are coming from the Simplex font and it doesn't include instagram.

So guess you need to use another approach, e.g. using FontAwesome which seems to include an Instagram icon.

Thank you for the response.
Any ideas how to do this or where I can find info about it?

Br
// Per