Unless you're using windows older shell style there is no start|settings, just start, from the control panel you need to select "network connections".
Choose the network connection that you're using (right click select properties) the Client, Protocols and Sharing will be listed in the middle window. If not enabled install file and printer sharing which you probably chose to allow durring the initial setup of the network.
I'll assume you've configured your workgroup and network shares.
More than likely, the problem is you haven't added the user to the PC that has the shared resources.
From control panel select "user accounts" Add the user following the prompts.
Set the security level admin, power user. If it's just your home network it's easier to just give the users Administrative rights.
By the way while you're in this window, disable the guest account if not allready done.
AS far as the shared resources, you can set specific permissions to access the shares.
To do so right click on the shared folder and select "sharing & security". Permissions is close to the bottom. Add the user(s) that you want to allow access.
Setup usage to be full, read only or write etc.
To map to the shared drives orfiles.
Open up "My network places", Then select, "View workgroup compputers" and you should be able to see the PCs connected to the workgroup.
Open the workstation with the shares and right click on the folder that you want to connect to thenchoose "Map network drive".
Should be good to go from there.