To change the Repo you have uninstall the Plugins, change the url and install it again.

1. Uninstall current version plugins

First disable and uninstall the Plugin:

Your will keep your settings!

2. Change Repo URL

Open Dalamud Settings with /xlsettings and go to Experimental -> Custom Plugin Repositories

Search for https://raw.githubusercontent.com/Jukkales/DalamudPlugins/master/repo.json and delete this entry.

After that add https://puni.sh/api/repository/jukka at the buttom empty url and press + and save.

Open the Plugin Installer /xlplugins and search fpr NecroLens or Hoard Farm and install it again.

All you settings will be taken over.