Hi Adrian,
Thanks for posting on the Support Community.
To get to the Grid Designer you need to have the Professional edition of ActivInspire. If you have Promethean hardware such as ActivBoards you should have an ActivInspire activation key stuck on here which starts with 0015/0016. This 20 digit key can be entered into ActivInspire to upgrade the software from the Personal edition to the Professional edition by clicking on Help>About>Register.
If you don’t have an activation key to hand, please let us know what model of ActivBoard you are using so we can best advise on how to get you an activation key.
If you do not have any Promethean equipment then you will need to contact a Promethean reseller to purchase this.
Once you have the Professional edition of ActivInspire you can change the squares to be bigger, click on Edit>Grid…
From here you can change the grid and add different levels to this.

I hope this information helps.
Kind regards,
Adam
Promethean Technical Support