Change an object using the dashboard

Hi,

tldr; I want to change an object’s text, using a button on the dashboard/ admin page.

Context:
For my friend’s website, I’m wanting to add an object which indicates when her pottery studio is open, which can be easily switched between the two states. i.e. when visiting the home page, a piece of text will either say “We are open!” or “We are closed!”

I was wanting to make it simple for her to switch between these two, by either 1. visiting a certain link. e.g. mywebsite.com/admin/imopen or …./imclosed, 2. or having a dashboard button/item to manage this.

I couldn’t find a plugin which would help me, so I think I’d need to code this.

I’m not sure how to do this. Could anyone give me suggestions? Or where to start.

• This topic was modified 4 years, 3 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic

The page I need help with: [log in to see the link]