I am using Command line in VSTS in the Release pipeline. Unfortunately not sure how to pass multiple arguments like "username", "password" and "siteurl" to the command line
If you are using Command Line task, you can use the format $(variablename) to pass argument. 
Such as below example:

For passing multiple variables in the Command Line task, the format is still $(variablename).
Such as, the command line script can be:
echo "Please enter your user name: $(username). Please enter to you password: $(password). Please enter the site url: $(siteurl)"
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