If you buy an umbrella, use your screen trough to an open umbrella and print it on. If not, you must disassembly it first. And umbrella canvas can print on your table. Both method need more skill.
The easy one is direct print in your open umbrella rather than dis-assembly it. Dis-assembly umbrella so hard. In my experience, doing that will make canvas torn.
But if you can't do both of it, I think go to a nearest screen printing company is better.