If you're soldering a component with multiple through-hole leads (such as a joystick module, microcontroller, or port), solder two opposite leads to hold the component position in place. Check the alignment, then solder the remaining joints.

Alternatively, you can bend two opposite leads to secure the component to the board while you solder.

If the molten solder doesn't flow or is hard to manipulate, apply more flux to the joint.