How to add coins?

How to add coins? I cant see any add button under "your coins" or even in my profile.
I dont see dashboard when I log in.

Go to catalogue - country list, choose a state, find a coin you have. You can also use a search option. Then open a coin sheet - like this one: https://en.numista.com/catalogue/pieces2157.html

And by filling the squares under "Manage your collection" you will add a coins to your collection - by adding numbers to the right squares you also manage to show number of coins you own and their respective quality.

Anyway, welcome to the site.