Authenticating to Sharepoint through APM

Okay, so is there something specific I'll need to do in AAM? The reason I ask is because I perhaps dont actually want Windows Integrated to be used when accessing through the portal... on the local LAN its perfectly fine and works when browsing direct to sharepoint, as users are logged onto domain joined machines with their domain credentials. The portal is there for remote access for our users wherever they maybe... they may not necessarily be using their corporate laptops and the usernames they have logged into their machines willl be different to their domain usernames (they could be using home computers, personal laptops etc that arent even a member of our AD).. so we dont want to pass these credentials.

The credentials we want to pass are the credentials used to authenticate against the Portal... these credentials will be the users domain username and password that I want to seamlessly pass to sharepoint.

I dont think I'm explaining very well. Regardless I will check AAM as soon as I can find someone in our sharepoint team.