The node allows you to dynamically set the credentials to be used for a specific node you want to run. With this you have to paste in a node you want to use, this can be any node with any parameters set. By then also entering the credentials ID the node is ran with those credentials.
Warning You can only use the same type of credentials as the original one set in the node that is pasted in. Be sure to enter credentials, so the node know which credentials need to be replaced. Without credentials set, the node cannot determine the credentialtype name and therefore cannot set it.