No Dashboard After Activating All-In-One Event Planner

Hello,
I’m looking for a little help if possible. I have a limited amount of coding knowledge and, I mostly stick to updating posts and adding links to new material. I added a embedded google calendar to my site but was not impressed by the look. I attempted to add the All-In-One Event Calendar. I was told that my theme, WordPress and plugins were all updated before I added the plugin. However, after it was installed through the plugin page on the dashboard, I clicked “activate,” as usual. Now, I can not access the dashboard at all. Everything I click on from the edit bar at the top of my site, goes to a white page stating “Are you sure you want to do this? Please try again.”
I’ve tried other devices and receive the same thing. Is there any way (besides going through the host site) to “undo, deactivate or uninstall” this plugin which has added the word “Calendar” to the top menu of my homepage almost 40 times?
I am checking out any options to learn for myself before having to ask our main computer tech that may not be able to address it right away.

I greatly appreciate any help!

https://www.ads-software.com/plugins/all-in-one-event-calendar/