It's easy to start a campaign for likes. You go to the Campaigns section in the sidebar of YTMonster.
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Hereafter, you will need to press the New Campaign button.
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Once you're on the "New Campaign" page, you simply enter your YouTube Video link in the first field. In the dropdown, you select "YouTube Likes"; hereafter, you press "Next".

In the amount field, you enter the number of likes you would like to receive.
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After entering the information above, you can submit the campaign as long as you have sufficient credits. If you've done everything correctly, a campaign for likes should now be live in the Campaigns section.