Clarify. A link of what leading to where? In a storygame, or in a post? Which person has done it?
Describe "a link leading to another". Another link to what? We can't help you if only give us half the info.
Just a link going to another in a Storygame... Gosh
You have to be using the Advanced Editor and advanced Links - then just use the Link Restrictions (the little red stop signs) .
Using the advanced editor, you would use variables and restrictions.