Say you just found the perfect game you want to add to your BBS, but you're unsure on how to configure it. Install the program. Some programs are compressed, needing uncompression programs such as PKUnzip, ARJ, etc. Others have their own installation software, which may or may not uncompress it. Make sure to follow the instructions as they are written, and try not to shortcut it unless you know what you are doing.
Doors usually have a configuration program or file containing various options.
This file is the file that the door software gets most of its information from. From this file, the door can get the user name, speed, location, and many more items, some BBS dependant. In order for a door program to be supported, your BBS usually must support a similar drop file type. Check your local BBS's for such converters. After you know what drop file to use, configure the door to use it, as said in the docs.