How to see someone's entire collection

Hello, can I add someone to some kind of "friend list" or something like that and view their whole collection if they allow me to?
I would like to register what coins I have, but I also want my dad or friends to have a chance to look through my collection... Any help appreciated, I'm a newbie here.

  To let someone see your collection, then go to your  Your account / Settings  and in Personal options tick  the box 'Allow everyone to view my collection'.

This is done in settings.  Make sure that the two shown below are checked.  All they have to do is look at your profile, (View) will show next to how many coin you have in your collection.

Personal options
√   Allow everyone to view the number of coins and countries in my collection
√   Allow everyone to view my collection

oyeee, done. And how do I find a person by just knowing his username?
Thank you very much.

  The alphabetical list of names of all members are at the end of the main Forum page.
https://en.numista.com/forum/liste_membres.php

 Your collection link to send will be ...
https://en.numista.com/echanges/voir_collection.php?id=38672


 Welcome to the site.  

Brilliant, thank you very much:)