Hi JCon,
Sorry for being blond (and Dutch), but these Q's are VERY elementary IT/network knowledge. If you do not know these... I'll give some directions, but this is not the place to educate on Windows/Networking
You first Q/picture:
EVERY computer has credentials on it's C$ (called C share and is a administrative networking share of your C: drive, needed for these remote-installations), namely the "administrator" and/or the administrator group.
Even the default user on your parents computer (which probable log's in automaticly in your case) can have a password. You can set/change it in the Control Panel / User Accounts.
You have to disable "Simple networking" (Folderoptions/View, the lowest option)
Find-out what the password is for administrator or set a pasword for the default user
Now you can connect to this computer using the following syntax: machinename\user where user is or "administrator" or the default user you gave a password to.
Your second screen is a feature in BESR where you can store your images. The path that is showing is a local path and therefore the netwerkcredentials are grayed-out. If you are able to connect to your parents PC with hostname\user:password, and in this screen instead of e:
... you use
\\hostname\folder\folder, you'll see the credentials part of the screen have to be used. You can then enter hostname\user:password. The moment you click, this combination will be checked before it continues.
That is it for now. Please take some time to get yourself acquainted with Windows & Networking