On the bottom of the PowerShot SX620, there is a hole with mounting threads... specifically, 1/4" x 20 mounting threads. This is standard for all consumer and most low-end progradre camera and camcorder equipment.
The ZOMEI Q111 is a low-end consumer-grade tripod with a quick release plate. T quick release plate has the "mate" to the 1/4" x 20 screw-mount. The quick release plates are easy to lose.
Assuming your ZOMEI Q111 still has its quick release plate, then that quick release plate will mount to the SX620's tripod mounting thread. If the quick release plate is missing, you need to get one. At the low end, each manufacturer makes their own quick release plates, so if you need to get one, you must get it from ZOMEI and it must be for the Z111.