No, Andrea, as Tiggerr has explained, you don't click on Write. If you click on Write, you're writing a new post with header and a format to fill in. You must have done that to create this new post.
You go to the weigh-in, following directions you've been given, you read the opening post by Gobbolino and you click on Reply below her post.
You also read what other people have been posting about their weights and give them some encouragement.
Are you using the app? You need to use the website, whatever device you're using
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