In Apex, we can set session value different ways- such as
It is easy to set value in form submitting. Just create input and a button. When you submit a value it will set as session.
First of all, you need to set a name Application Items in Share Component : Application 108> Shared Components > Application Items > Create / Edit
:P33_SESSION_BIND_ITEM_2 := :P33_INPUT_BIND_ITEM_2;
In input field:
BEGIN return :P33_PARAM1; END;
In static or label, write
&P33_SESSION_BIND_ITEM_2.
...