Being homeless and needing help!

I have no idea what to do or how to get started ! I think I applied online but I still don’t know what to do or how to get started! Can I someone help me please!! My name is Katie, I’m 42 yrs. old and my husband passed away a year ago, I haven’t been able to work since I couldn’t afford to pay rent because my husband worked and I stayed home and took care of our kids and I still stayed home because I have PTSD SO IT’S hard for me to be around a lot of people ! I’ve been homeless for over a year and I am in desperate need of a place to live a place to call my own !! I’d appreciate any help I can get!!