Hello Nir,

There is no problem,
You have to set long position's logic in the strategy slots.

If you want to buy when RSI < 20 and to sell when RSI > 80, you have to set the rule for the long entry only. In this case the rule should be: Enter long when RSI is lower than 20. This also means that the short entry is when RSI is higher than 80.

[Opening Point of the Position]
Bar Opening
     Enter the market at the beginning of the bar
     Base price  -  Open

[Opening Logic Condition]
RSI
     The RSI is lower than the Level line  <---------------
     Smoothing method  -  Simple
     Base price  -  Close
     Smoothing period  -  14
     Level  -  20         <---------------
     Use previous bar value  -  Yes

In the "Strategy Overview":

Opening (Entry Signal)

* Open a new long position at the beginning of the bar when the following logic condition is satisfied:

              the RSI* (Simple, Close, 14) is lower than the Level 20.

* Open a new short position at the beginning of the bar when the following logic condition is satisfied:

              the RSI* (Simple, Close, 14) is higher than the Level 80.