When you say you can't delete them, do you mean you can't remove them from the macrobar? Or are you trying to delete a macro from the Collections tab or a Character sheet 'Attributes and Abilities' tab? To delete a Collections tab macro there's a small red "Delete Macro" button on the edit popup window. You'll have to scroll down in the popup window to see it. To delete a Character sheet macro there's a small 'X' delete button on the 'Attributes and Abilities' tab, just to the right of the edit 'pencil' icon and 'hamburger' move button. Do you have any browser extensions turned on? Those could interfere with your ability to click on things. If you're just trying to remove them from the macrobar, try hovering the mouse over the right side of the macro until you get a little handle, then click and drag it out into the middle of the VTT and that should delete the macro from the macrobar.