Mentimeter does not usually provide phone or on-site support. This is because Mentimeter is so easy to use that over 7 million users in 55 countries are using our service. Once you register with a free account and start exploring the features, you will be able to pick up the tool very quickly!
If you wish to get some help to get started with Mentimeter, you can visit our Guides page here as well: https://www.mentimeter.com/guides or keep exploring this Help Center.
However, should you necessarily need additional support for your event, do contact us at firstname.lastname@example.org and we will try to find a suitable solution for you!