DaVinci Resolve 14 HELP!

Hey everyone, I’m new here so if this has already been discussed please just point me in the right direction.

Recently my wife bought an IMac, I’m a PC guy but I have hard Macs are excellent for editing, so I installed the free version of DaVinci Resolve. My issue is I can’t import any media what so ever. I don’t know if it is an issue with me, the program or the file types. I have been out of the editing game for a while, the last program I used was Sony Vagas back in 2007 and Windows Movie Maker every now and again. Any help would be greatly appreciated, thank you in advance!