You can "connect" in your store procedure as the same way that execute any other query. Store procedure don't have a different way to access, you simple have to call the procedure, ex:
call MyDB.procedure_tes(param1, 'param2', param3);
If this parameters are dinamic, you can use the report parameter or variable, ex:
call MyDB.procedure_tes($P{param1}, $V{param2},$P{param3});