You can copy opponents' nickname using the HUD / Player panels / OnClick / Copy nickname to clipboard function. Add a panel to the Player panels list, set Copy to nickname clipboard in OnClick and when you click on the panel, the nickname will be copied. You can also open the search site page for this nickname in the same way, for example Sharkscope. To do this, in OnClcik, select Search the Web and insert a search string below, for example https://sharkscope.com/#Player-Statistics//networks/coinpoker/players/[SCREENNAME]
When opening url in browser, [SCREENNAME] will be replaced with player's real nickname.
If you wish, you can also copy it simply by clicking on some area - for example, on the opponent's nickname or avatar. To do this, make a panel of only spaces (change the height of the panel with the panel font size, and the width by the number of spaces). Place all copies of the panel in the places you need (above nicknames / avatars / somewhere else). Turn on Background / Invisible in the panel properties. As a result, the panels will not be visible, but they will react to clicks as before. This option will only work if the Options / Alternative method of a mouse processing in HUD option is disabled.