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BP Profile Shortcodes Extra has a shortcode [bpps_whats_new] for the activity What’s new form, you could put that shortcode into a text widget.

did you install https://wordpress.org/plugins/bp-profile-shortcodes-extra/ ? it should works with that installed

Just that shortcode, it should just work, simple as pie, are you getting any errors? Do you have an error log running?

I’m thinking that there maybe a conflict somewhere, this is the second plugin that’s not worked for you.

There’s other options, there’s BP Activity Shortcode, I think you can get that to do the same thing.

Try [activity-stream allow_posting=”1″] this should test is, I’ve had a look at the shortcode and I’m not sure it’s possible to only display the What’s up screen without showing some activity, but it’s worth testing to see if you get the input form.