You can easily pay your Federal and State tax liabilities online.
To pay your IRS (Federal) liability, go to the IRS website here: https://www.irs.gov/payments
And for a step-by-step tutorial, choose one of the items below: tutorials coming soon
To pay your CT liability, go to the CT Department of Revenue website here: https://drs.ct.gov/eservices/_/
And for a step-by-step tutorial, choose one of the items below: tutorials coming soon