When you search any audience via Audience Search, you can add them to an Audience List.
From that audience list you can move each of the audience to your Facebook Ad Sets.
Note: When you apply interests to your Facebook Ad Set, it will add it to your existing targeting. In other words, it will not replace the interests that have already been added from within the Facebook Ads Manager.
How to get your support tickets resolved faster
Statistics have shown us that the more you tell us when you report an issue, the faster we solve that ticket. So...
1 - If you have screengrabs, please include them. A picture is worth a thousand words.
2 - If you have recorded a video showing the issue you're having, please include that as well. A video is worth a million words.
We recommend a free service called Loom for creating these videos. (this is a link to https://www.useloom.com/)
3 - To speed up ticket resolution, follow these useful tips How to Write the Perfect Support Ticket (That Gets Results Fast)