Ok, no problem.
There are a few plug 'n' play type methods for sharing data on a network, but over the years and in my job I have found them to be hit and miss and so don't use them. Here's how I set mine up, this is what you could call the 'traditional' way

. It's possible to do this without the use of passwords, but sometimes Windows doesn't like having accounts with no passwords and so this is how I've always done it:
**PC**
1) Create new Windows user on PC, we'll call the user 'Shield' - give it a password
2) Share media folder(s)
3) Give previously created user permission to shared folders (read only will suffice)
4) Make a note of the network path for the new share
E.g in my case this is \\HTPC\E\Movies
**Shield**
1) Add an SMB video source in SPMC
How To Setup SPMC On Android - The Essential Guide | Home Theatre Life In the guide, this is referred to as a 'remote location'. More than likely, when you click SMB Share, SPMC should find your Windows share automatically and you just need to select it and enter your password when prompted.
In my case this would be:
smb://HTPC/E/Movies
That should give you access to your media, then it's a case of setting up SPMC however you want it
