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The state of Playstore
(lemmy.dbzer0.com)
This is a most excellent place for technology news and articles.
The system will prompt you to allow Fdroid to install apps as soon as you download something the first time. Can't miss it
Otherwise, you'll find it under
Settings > Apps > Fdroid > installation of unkown apps
(or something like that, my system isn't in english)
Thanks!