The process for creating an account and adding GameMaker Studio 2 products to your basket is described in our Help Article Getting GameMaker Studio 2 Licences For Education and this can be followed until the section "Buying Additional Licenses"
At this point, once you have made sure the purchase details - shown on the right of the image above - are correct (you can make any changes required from your Settings > Profile section of the YoYo Account dashboard) you can select "Pay by bank transfer"
An invoice will be created and you will be taken to a page similar to the example shown below:
This page includes all of the information you will need to make a purchase.
To return to this invoice later, you can click on "View invoices" from your account's Seats Page which will take you to your Invoices Page.
When you submit information for the bank transfer, we would ask that you include the 'Order ref.' you have been given (in the case of the example above, EDU3009621049) as the first text in the reference field of the transaction and once payment has been submitted we would ask that you click "Mark invoice paid" to help us track the payment for the purchase.
Please note: YoYo Games are based in the UK and as such bank transfers from schools within the UK may take 3-5 business days to transfer, with international bank transfers often taking longer.