Shelli Comer

I am new to all of this, and not the tech savviest. I am trying to install a mod for my ten year daughter. I downloaded the mod, but can’t seem to get Forge to download. ? I’ve spent hours, with no luck. 1. I get a error message that says there is no Minecraft directory set up. 2. I then click on three dots that allows me to roam, but can’t find where to go. I tried to send you pictures of the errors, but the uploads won’t come up. I really appreciate any help that I can get. Thank you so much in advance... Shelli