--SOLVED--Please configure your payment methods

Hi,
i keep getting this error message "Please configure your payment methods", but when i try to set a method, i couldn't find the option which i would like to select, which basically is only to accept "cash on delivery".
When i click on the only button at the bottom "Finish", nothing happen and i keep being bounced back exactly on the same page like if i only pressed to refresh the page.
There is any ways to get rid of this error message, and once someone click on "Finish" the customer get into a page that say the order has been received/accepted, while at the same time the Admin get a notification of the new order just being made????
I try to browse the forum and the FAQ for a solution, but i can't find it,
Thanks

Updates:
First of all i would like to report a presumed bug/malfunction on this forum, as when i clicked on "My Topics" to see if this post had been approved by the Admin (that's the warning i got after i pressed the "submit" button, that my topic needed to be approved before being published), it was empty....however after a quick check on the new topics, i found it, so here i am.

Getting back on my original issue, i didn't know that i needed to enable that plugin ( "HikaShop collect on delivery payment plugin" ), at first after reading about it i thought it was some other external app that i needed to download, then i found someone mentioning that the "collect on delivery" was a plugin, so i went looking for it and i enabled it.
The problem it's still there, even if this new option is ticked on the check-out page, ironically the HikaShop is still displaying that error message telling me that i need to configure the payment methods first, and when i click "Finish" to finalize the purchase, nobody receive any confirmation about it, not the customer nor the vendor, something it's clearly broken or misconfigured here....

Update on the updates:
Now when i click on "My Topics" on this forum, i can see this topic, before there was nothing there.

Update on the second part of the updates:
I have been changing and looking into so many places, now it works....please don't ask me why, i don't know, however a new problem just arrived, it seems that i need to configure an email, i will try to find a fix myself before i post again..