Here are detailed instructions in our wiki -?
2.1 Return to the bookmarked page (/yahootransfer). Click on the big green button at the bottom that says "Set Up New Transfer."
2.2 Enter the name of your Yahoo group and the name of your groups.io group in their respective boxes. The groups.io group is conveniently selected from a pick-list of those groups that you own. Do NOT enter any domain information (i.e.: leave off @yahoogroups.com or @yahoogroups.co.uk), just the group name.
2.3 Click the big green "Start Group Transfer Process" button at the bottom of the page.?
(You have now completed Step 2 of the instructions)
Was your Groups.io group not in the dropdown menu? A basic question - I am assuming that you have created a group in Groups.io to be used as your destination?
See?/g/GroupManagersForum/wiki/FAQ-on-Moving-from-Yahoo-Groups
and the links in this section:
7. Where are instructions for transferring to groups.io?
Transfer from Yahoo Groups (Groups.io instructions) - official instructions
Detailed instructions on how to conduct a Yahoo transfer - Group Managers Forum
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"Best practice" advice with screenshots: ?/g/GroupManagersForum/wiki/Transfer-from-Yahoo-Groups
Frances
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FAQ on Moving from YahooGroups
GMF Wiki: (unofficial) Help for members (and would-be members) and group managers
Frances