You said you're "near" San Ignacio, so as long as you can get out to the highway, buses pass every 30 minutes. Wait on the south side of the highway (that's the lane heading towards Belmopan & Belize City), and wave at an approaching bus. All buses from Benque will go to San Ignacio and then Belmopan. When the bus stops, get on and find a seat. After the bus gets going, the conductor will come to you to collect the fare. Tell him you're going to Belmopan -- the fare should be in the order of a few BZ$.
Check this site for bus info...
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