How do do invisible join seam?

I knit a dishcloth in the round, but it needs to be joined together now. I Lready made one, using a join I thought would work…it’s lumpy. Is there a way to do a join which is invisible? TIA!

I’m not sure I understand. If it’s knit I he round why does it need a seam? :?? Can you provide a link?

I think she means it is flat, circular in shape. Not in the round like socks for instance.

Something similar to this? http://www.groupepp.com/dishbout/kpatterns/cotcloth.html
When I did one I started with JMCO (any provisional cast on would work) and held half of the sts on yarn until the end when I used Kitchener stitch to join the held sts and live sts on my needle. I have to really look closely to see where I started. I knew from the get-go I did not want that seam. HTH