Some tomatoes pollinate by themselves or by the wind. But with squash and zucchini you must have the bug or bees that will do the job for you. Here are some instructions that I googled for ... hope it helps you.
In order to hand-pollinate, you must be able to tell the difference between male and female
flowers. Female
flowers have a tiny squash right behind the
flower (and if your pollination efforts are successful that tiny squash will develop into a squash rather than shriveling up). If you look inside the female
flower you’ll also see a stigma, which is a sticky, round female reproductive organ. Male
flowers have straight stems and anthers (the male reproductive organ), which look like small cotton swabs dipped in bright yellow pollen.
Squash
flowers open up in the morning and stay open for one day. Hand pollination works best if you do it as soon as possible after the
flowers open. To hand-pollinate, snip off a male
flower and peel back its petals, leaving the pollen-covered anthers exposed. Nuzzle the anthers onto the stigma of a female
flower, leaving a dose of pollen behind.
Discard the male
flower after you’ve pollinated three female
flowers. You’ll know your hand pollination worked if the little squash behind the female
flower begins to grow and the female
flower falls off.
To encourage more insect pollinators, plant
flowers that produce lots of nectar, including sweet alyssum and bachelor buttons near your squash plants.