Its been a long time since I used DD-WRT but I can try to help until someone more knowledgable comes along. So to start with here are some basic questions.
What type of ISP do you have, ie. cable or DSL or what?
Can you login into the router admin pages?
Is your main PC connected by a wired Ethernet cable to the router so you can configure the router?
What exactly did you do to try and configure DD-WRT to access your ISP?
FWIW I am also a 60+ year old Official Old F**t (aka OOF) and loving it... -- "When all else fails, read the instructions..." MS-MVP Windows Desktop Experience
