but how does it work? https://www.dynadot.com/community/help/image/441-1.png is almost useless. Can't you provide a bit more detail and an image where the subdomain name is not cut off? A couple of examples wouldn't hurt either.
That image is outdated. We'll update it as soon as possible. You can refer to step 6 and step 7. https://www.dynadot.com/community/help/question/add-SRV-record 6: Enter the Service and Protocol values together in the subdomain box. Add a period between the two. 7: In the "IP Address or Target Host" field, enter in the Priority, Weight, Port and Target. Only add one space in between each value.