shifted orthogonal modes waveguide port

Hello,i would like to have the two orthoghonal modes TE10 TE01 and shift them 90 degrees to create circular polarization
in the CST menu i can only choose the number of modes but i cant know which modes specificly will be generated.I can choose the polarization angle

so by choosing two ports and 90 degree polarization i will only get two orthogonal ports? correct?
and the shift between them will have to be done using the slot in the patchantenna?correct?
thanks

the photo of the CST port menu in the link bellow