Add pagination to your page, and simply set the data source of the repeating group using the pagination element.
No need to worry about total item count or page number!
The plugin presentation made me think that I could use it with the repeating group already created and working, whose pagination should be implemented. However, it seems the plugin does not work based on repeating groups. Actually, the documentation is so poor that makes it useless. If I could, I would get my money back. I DO NOT RECOMMEND IT.
PS: It is very common problem in Bubble ecosystem, full of interesting plugin and templates, but most of them with poor or very poor documentation. Documentation that makes the payer use the product in a easy way is as much important as the product itself, but it seems most of the developers only understand coding.