You are required to share screenshot or images of your 3D model and the link to your model.
on the menu panel, click Share.
Then, enabled it and copy the link to share.
After open the padlet, type title of your model for the subject, then upload the image of your model and type your name at the description area and share the link of SketchUp Web at the comment area. Then, click Publish. Thank you. 😊