Subscribe by Email editing Custom_Post_Type name

Hello. I previously had some help with a problem (link below), where I needed to display "custom_post_type" name in front of the 'title'.

https://premium.wpmudev.org/forums/topic/subscription-for-custom-post-types#post-1144865

Now, I have noticed that 3 of the "custom_post_type" categories that are preloaded with the theme we are using has a name of "lstvevents" or "lstvnotices", etc. We need to edit these to display "Events" or "Notices" instead of it's true "custom_post_type".

Is this do-able? While I'm sure it is, how hard would it be? Anyone able to help?

Thanks,
David