Server Error Logs - How Do I Find Them?

Hi there

This may not relate to WPMU Dev software as it is an external plug in...but for a Job Manager plugin I use, the client was trying to list an advertisement but one of the fields didn't display (ie job descrption) - it was just blank.

I emailed the developer who emailed back with:
"It looks like it has errored at the point of the description field (for this logged out user). You should check your server error logs to find the cause - there are no reasons why that function wouldn’t be available to output the editor field on the frontend in normal circumstances."

How do I check server error logs?

That's the bit I am not sure how to do. I am with Hostmonster, so do I check a particular file?

Help! Thanks for any suggestions to find out what is going on.