Turbo Tax asks me if I want to send a check to IRS? Can I just pay by my card?

I filed an extension and I am at the final step and then Turbo tax says "mail a check" or "request an installment plan"....Can't I just send in my tax return showning the amount due but pay today by my card online one one of those tax sites?

 

Thanks!

 

Or do I have to send in a paper check?