The pool's been fixed, but if you run into it again, just replace "
Select region above" string with "
mp3.markmine.io".
For example, to mine Bitmarks to addresss bVJUEijXfsKQ1CuTbzwgvp6M34x12oZgZv
URL: stratum+tcp://mp3.markmine.io
Port: 3333
Username: bVJUEijXfsKQ1CuTbzwgvp6M34x12oZgZv.worker1
Password: x
Commandline example:
./sgminer -o stratum+tcp://mp3.markmine.io:3333 -u bVJUEijXfsKQ1CuTbzwgvp6M34x12oZgZv.worker1 -p x -I 13
Note: Use your own address, (unless you want to donate BTM's to me

)
Get one from your GUI wallet or the 'getnewaddress command', of the RPC JSON client:
~/.bitmark$ btm getnewaddress
bVJUEijXfsKQ1CuTbzwgvp6M34x12oZgZv
or, using the abbreviated form
~/.bitmark$ btm gna
bGD3YDPvPAaqSXKQ4k4ANMVdF9YyjR43ef
Thank you dbkeys, you are the man. She is chuggen away now