Clickworker W-9 Signature

How am I supposed to sign this thing? Using a chromebook. I filled it out, up to that point. Nor can I find it with their w-9 search tool. Will I have to close it first?

submitted by /u/Possible_Debate4430
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source https://www.reddit.com/r/beermoney/comments/103ljom/clickworker_w9_signature/