Setting delay times

I am still very new to using QC, but having captured my own Vox AC15 - I am totally convinced - it is completely amazing. However, I am trying to build a few presets, and want to use a few different delays , but when I add a delay block, select Digital Delay, I am not allowed or able to adjust the tempo. This seems set permanently to 500ms, the parameter tempo icon is ‘greyed out’ and there is no means to change it. I am obviously doing/not doing something wrong, can anyone enlighten me? Thanks

I imagine you have it set to sync to tap tempo by default. If you switch the sync option to off it should let you set the delay time