how do you take of the gear nob on a micra

[manic666]

1 have a 2010 micra diesel , its fitted with a diesil power box unit now 115bhp and tourqe to pull a train, Lowered 60mm with wolfrace 17inch split rims tyres 205- 40mm plus K-N filter. 120mph BBBBBBBut i carnt get the gear nob off is it glued on , i dont want to snap it, help please