Dynadot support can be reached by clicking on the SUPPORT link in the top right corner of their website.
You have the choice to submit at ticket or during certain hours, select the LIve Chat option, by clicking the number 2 in the image below.
Alternatively you can submit at Support Ticket, so the team can respond as soon as they are available.
You can also navigate to a contact us page where you can email them OR start the live chat option. You can find that page here.