something about constraints in the Optquest Optimizer

Hello,
i want to edit a linear equations in the constrains section of Optquest, and the equations is something like this: x<1 or x>5. The equations i added in the blank is x<1||x>5, but it doesnot work, so i realize the equations mabybe is not something like codes. My question is how to write the equations to make my constains come true? and i notice there is a linear constrain type, what else constrain types does it support?