Ok heres a simple guide:
1. download seose from sordie.co.uk
2. get the pubs and maps from your endless online folder
3. open seose ini and if u need to change anything thats great
4. now see if seose will run if succesfully runs great if any errors post.
5. go to portforward.com and select your router and then your model number then folo the guide.
6. go to no-ip and setup a host
7. if succesful goto your seose ini and go were u see all the writing saying your host server name ect and chang it to what you want.
8. now run seose and go to sordie.co.uk and and go to portchecker and see if its succesful if it his grats.
9. tip: u use 127.0.0.1 to connect to your server but other need to use the no-ip to connect.
hope it helped like i said any probs just post