Logic Pro 9 external midi


Hey there new to the group and was looking for some help i have been running logic since about oct last year and i have a good feel for it now, till last night.
i was using a m-audio axiom 61 witch was real good but i went and bought a real synth, i bought a waldorf blofeld keyboard, i can get it to work how my m-audio worked through logic and it works as a synth when not going through logic BUT I CANT get it to work as a external midi through logic.

any help or put in the right direction about how to get it to work would be so much appreciated, look forward to hearing from use

regards james