Two windows pcs, right? Click "file explorer" and in the search bar, type the IP address of the remote PC with this syntax "\\x.x.x.x\c$" where the x.x.x.x is your remote PC's IP address. Probably something like 192.168.1.25 or whatever. the "c" is the drive letter you want to access, most of the time it will be the "c" drive unless you have a second hard drive. The $ is for admin privs. Simply navigate to the file you want and drag and drop, or copy paste and you're done. You will be promted for remote PC's creds (whatever you login to that PC with username and password).
To find the IP address, if you don't know, click "start", type "cmd" hit enter. Then type "ipconfig". You'll see "IPv4 Address" with something like 192.168.1.25 probably. That's the IP. You may have different interfaces with different IP addresses, like an ethernet, wireless lan, etc. Whatever is on the same LAN should work, wired (ethernet) will likely be superior in terms of speed.