How to increase and decrease

Good night.

please help me, can you help me, how to increase and decrease the value of temperature and time with the widget on blynk ?
Maybe you have some examples

Thank u

Which widgets are you planning to use?


Button and side bar

Okay, Attach the widgets to virtual pins and when you use the app to change their values the BLYNK_WRITE(vPin) callback functions associated with those pins will be triggered.
Use these functions to change the variables that you are using within your existing code…

Read this for an explanation of how theBLYNK_WRITE(vPin) callbacks work…