The space between the inner lips from clitoris to vaginal opening is called the Vestibule. In a full squat, knees shoulder or more apart, the vestibule should open and you should get a direct stream from the urethra. On the toilet, use the saddle position (facing the wall/tank) to get the knees well apart if there's room. If you can't saddle, keep the knees apart and lean forward as best you can.

Once you're familiar with how this works, you can put your finger tips between the inner and outer lips as shown:

Vulva Drawing Permission granted for non-profit duplication and display.

Practice in the shower and eventually you can do this standing (mostly) with your knees out and hips rolled under. Starting with a strong stream helps. Good luck!