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1. Go to https://en.wikipedia.org/; the English Wikipedia front page displays.
2. Click Log in; the sign in page displays.
3. Click Join Wikipedia.
4. Follow the instructions to create your account (do check for the confirmation email to activate your new account).
5. Log into Wikipedia.

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The easiest way to let them know is to insert a pre-prepared notice called a Template. This allows Wikimedians to easily list all participants and give you access to the Translation plugin.

Here's how to do that.

1. Be logged into Wikipedia at https://en.wikipedia.org/.
2. Click 'User Page'; your own page displays.
3. Click 'Edit this page'; the page displays in edit mode; not the extra controls.
4. Click 'Insert'; a drop-down menu displays.
5. From the menu select 'Template'.

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Using this template also lets you see who else is participating in the event - participants using the template are listed here.

Third, enable the Translation Tool for your account

If you experience any issues with this, don't worry - ask a Wikimedian on the day and they will enable it for you.