network credentials
I am using a wifi network for an Apple Macbook Air (Late 2010, OS X Yosemite) and attempting to connect to a windows 7 laptop on the same network. Need access to its files, printer, etc. I can see both computers on the Network Page in Settings. When I double click on the Windows 7 laptop icon a security screen opens asking me to enter Network Credentials to connect to the laptop. Same thing occurs when attempting to add a printer connected to the laptop.
The network credentials are a User Name and a Password.
Where can I find these? I have no recollection of setting this up and thus do not know what they are. Is there anyway to delete current settings and reconnect to the network?
Many thanks for any help.
MacBook Air, OS X Yosemite (10.10.5)