PoetsUnlimited is accepting new contributors for a (very) short time. Just click on the ‘Contributor Guidelines’ link and you can read the rules and follow the link therein to the form that gets you on your way.
Remember though, PU only publishes ‘free to view’ stuff, so ensure you un-check the premium paywall settings on anything you submit after joining.
(Also, don’t submit a pay-to-view poem as a sample, ‘cuz I can’t read it.)
Excited to meet the new contributors and share their work.