I believe you simply jump on and then jump off. I thinkhere is a peg on the left side of the frame. you put your left foot on it and push or kick off with the right an swing your leg over. dismounting would be similar but not as graceful.
I beleive this is where the practice of mounting a "safety" bicycle in a similar fashion came from. not to mention everyone in the '70 riding 25" varsities
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk