You have the option to nickname your labware to something that’s easier for you to keep track of. It will be referenced by this name everywhere else in the Protocol Designer.
To change the nickname you can
Hover over the labware
Click "Name & Liquids"
In the left-hand panel click "Labware Name"
Click + Drag your labware to a new slot on the deck.
You can delete labware. However, you will have to adjust the steps you've made to account for that change.
You will not be able to change your labware into a different type once it's in place. Please check you've selected the correct labware before laying out where your liquids start inside.