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Woud really appreciate some ideas and/or rebounds on this one.

Trying to design a diagram/visual that accomplishes the following:
• Does not require any words at all (other than the URL).
• Indicates that this is a critical step.
• Indicates that you use your browser (computer or smartphone).
• Indicates that you can use either a computer or a mobile device to do this.

This is for a print document, so interactivity is out.