I am sorry to hear you have encountered troubles with Jira integration and will be happy to assist you on that.
Basically the steps to follow in order to connect to Jira cloud are listed here
. However, the important note here is that you use 2 factor authentication and thus using a password only to login to Jira will not be an option anymore - here
you can find additional notes on the case provided by Atlassian.
Having that in mind, you will need to create an API token for your Jira account
and use that token instead of password in Test Studio to connect to the Jira cloud.
Please, give this a try and let me know in case you have any further troubles.
Thanks for your cooperation in advance.
P.S. Our help documentation will be as well updated at the earliest.