Good day, cattanfabian,
In order to connect Jamaican banks, you'll want to make sure you're signed up for QuickBooks Jamaica. The supported banks will show on the search bar, or if you enter the name of the bank.
The supported banks you see on the account depends on the country you're subscribed with. You can select Jamaica here: https://quickbooks.intuit.com/choose-country/.
Once signed up, enter the name of your bank or the website where you sign in for online banking. Check this article for more information: Connect bank and credit card accounts to QuickBooks Online.
Here are articles for future reference:
Let me know if you have additional questions. I'll be right here to help.