Help with Workflow Rule - field update - Created.date + 30 days

Hi,

I have a custom field on Leads named "EndSubscriptionDate"

I need that EndSubscriptionDate value will be lead's creation date + 30 days.

I've tried to create a Workflow Rule https://prnt.sc/rdokqn

In this field update I want that the value will be Created.date + 30 days. https://prnt.sc/rdokzl

Please help

Yair