Steam trade url !

I want to change the steam trade url saved in my account…because i am using the new steam account…I am getting this error when I want to update the steam trade url… please help…
I want to buy csgo item

Go to your profile on then: Item Inventory » Trade Offers » Who can send me Trade Offers? » Third-Party Sites
Click “Create New URL” to generate another to paste into Gameflip. I think the error is caused by the _ character in the token, try re-generating a URL that doesn’t have the _

I do not use the steam account I saved to GameFlip…I want to define my new steam account.
it is not true that you said:(

You need to make new gameflip account to use new steam account on it.