WebTemplate: How to supply a Planning Function with with values

Hello.

I created a Planning Function (in Planning Modeller), that uses input-ready variables.

I.e. I created an input-ready variable VAR, that is connected to InfoObject 0INFOPROV, that supplies my Planning Function with the the techn. name of a InfoProvider. This seems to work fine, as I am forced to enter a value for this variable VAR, as soon as I execute a Planning Sequence (@ Planning Modeller) that contains this Planning Function.

Now, how to execute this Planning Function via WebTemplate and supply the variable VAR with a value, the User entered in a text field in WebTemplate??