How do I ride?

So my boyfriend and I have had our first time in March. 
I want to spice up our sexlife a little. 
I really know how to dance but I cant ride. 
When I sit on it I can't move. 
I really don't know what's wrong. 
Does anyone know what I can do about it? 
And does anyone know a position where I "work" and he enjoys? 
I know how to give head and stuff but this is getting boring

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