To activate alert, you must manually create an alert. By selecting in 'Condition' TMA v0.42 and the option 'Any alert () function call'. The types of alerts can be found in the indicator settings. Each time the parameters are changed, a new alert must be created.
Good tool for estimation, but in no way should it be used in "signaling" mode since the signals are going to change because of recalculating and repainting.