How can I add any webpage as a "page node" ? I get error if I did link it to a /page/...

[NandorHUN]

Hi!

How can I add any webpage as a page node?
If I create a page node and simply insert any page link I get an error "Please enter a value using only a-z, A-Z, 0-9, - and _ characters."

But if I add any value it will direct me under myxenforo.com/page/ site...
How can I add any webpage as a "page node" ? I get error if I did link it to a /page/...

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