Storyteq facilitates a pension provision, via BrightPension. Storyteq pays for the initial costs and the yearly administration costs. Every employee decides for themselves how much of your net salary goes into the pension fund (there is a maximum, which can be calculated here). Every month, this amount will be deducted from your bank account by BrightPension.
On your yearly tax return, you'll fill in the amount that you put in your pension provision, and this will be deducted from your taxable income. So in effect, you won't pay tax over this amount now, but you'll pay it whenever it is paid when you are retired.
Storyteq only has a facilitating role in this. So whether you want to do this, is completely up to you.