Please note, depending on your user role, the following actions may not be available to you.
To change which units are live, firstly head to your Dashboard, click the three dots in line with the relevant development and then click 'edit'.
You will be automatically brought to the ''Unit settings & availability' tab. Next click 'Edit availability' next to the relevant block. Now you'll be able to tick or untick the units in this block to mark these as either live or not ready for sale. Simple!