If you're following all the steps according to the Instructions and the Delayed Press Mod is not working properly, there could be 2 reasons:
1. The time a configured button being held down is less than the time a game requires to execute an action. The 5TH sub-mode (Delayed Press) is very useful in situations requiring a user to press and hold a button for a longer time in order to complete an action.
The only condition is to set the timing properly while customizing the delayed press.
Perform an action using a stock button and try estimating the exact time it takes to complete the action, then proceed to a programing mode to mimic the input.
2. The time a configured button being held down is greater than the time a game requires to execute an action. You always want to match the timing it requires to execute an action as precise as possible. Keep in mind if your macro timing is greater than it has to be, then it may block other button inputs, since an action has been executed, but the modchip continues holding down a configured button.