How to create, move, and delete guides in Adobe Illustrator
Create new Illustrator document
Adjust your artboard size
Adjust your artboard measurement units
Create some design
Select View - Rulers - Show Rulers
Create (drag) guide from ruler
Select View - Guides - Uncheck Lock Guides
Move guides in illustrator
Or you can delete guides (with Backspace or Delete button)
How to create, move, and delete guides in Adobe Illustrator