1) From the dropdown menu on the right Select either Weekly, Fortnightly or Monthly.

2) In the "Qty" box enter the amount you would like to save for the given period.

So, if you decide to save £10 every Month, Select Monthly and Qty 10.

Remember that you only receive the amount you put in

This means that, if you decide in January to save £10 per month, you will only receive £110. January to November = 11 months... 11 * £10 = £110.