How to add a anchor menu in the side bar

Hi there,

i’ve been trying every possible way with this theme just to add a simple menu first and this make it as a anchor menu but i just do not know how to do it.

what i have done so far is created a custom menu something like (URL #Profile, label: profile)
and then made it a primary menu and added it to the sidebar widget but it not showing.

here is my website, it is a one page portfolio:
https://www.muhannad.co.nf

and here how it should look like:
https://www.dotrex.co/vertica/themes/james.html