Hi @BrianPES
Once you have installed Fusion 360, simply sign in with either an educational, hobbyist, or commercial account and the appropriate license, and you should be good to go for using Fusion. Also, check your internet connection, as that may be the source of your problem. Once you begin modeling, your files will get backed up to your A360 account, where they will be able to be viewed from anywhere.
If this helped solve your problem please click "Accept as Solution" as it allows others to find the answer to a similar problem faster and more efficently!
I hope this helps you out,
Cole