I installed this chat and can not find where you can delete messages and see the IP guests?

You can delete the messages from the freichat backend -> Server side -> Purge/delete message history .

FreiChat does not store the IP addresses of the guests .

I do not need to remove all the messages are just a few.
In the paid version, IP guests also not saved?

In the paid version, IP guests also not saved?

No, since it has no benefits . Most of the IPs are dynamic so it is useless to save them.