Tried forever to remove projects. Seti - LHC will allow me to do do, but I want to keep them. I have about four or five others that I want to remove. Can't! I gave up with Einstein a few years ago trying to do the same. Why can't simple tasks be just that? Simple! Their home page does not even suggest it.
Thanks to whoever for whatever.

BOINC Manager
If Simple View->Select project->Project commands->Remove->Acknowledge
If Advanced View->Projects tab->Select project->Remove->Acknowledge

If you added these other projects through an account manager such as BAM! or GridRepublic, you will have to remove them via there. You can check if you are using an account manager if the Tools menu has a Sync option. It will also tell which AM you use then.

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If you added these other projects through an account manager such as BAM! or GridRepublic, you will have to remove them via there. You can check if you are using an account manager if the Tools menu has a Sync option. It will also tell which AM you use then.

... it is not all THAT easy ...

I "detached" all my rigs using BAM (unchecked the ATTACH) for the project!

So then I was able to REMOVE in BOINC Manager the "Ralph at home" project, except for three of my rigs.
These three rigs give me a status of "... Will remove when tasks done".
What does this mean?
I don't have any tasks running for RALPH -- haven't for a LONG time.

Dumb as I am, I will try almost everything ...
So I let my only one other running project finish all WUs (on all three rigs that are showing me the message).
Then stopped BOINC.
Restarted all three rigs.

AND guess what: Same problem err... message.

I would appreciate any help very much!

Make sure task from RALPH aren't suspended and that there aren't any tasks waiting to run still in cache. You can double check that via BOINC Manager->View->Advanced view->Tasks tab->check on the left, the top option should say "Show active tasks". If it says "Show all tasks" click it so it shows "Shows active tasks". The button shows the option you have, not the state it is in. Else select RALPH and hit Update. Or do Tools->Sync

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Thanks for your quick response.

The tips are surely of good help.

BUT:
There are no RALPH tasks (WUs) in the cache.
No RALPH tasks suspended.
I know how the buttons work.
I know what sync is --- as far as I know exiting boinc and restarting rig (PC) and starting boinc does a sync on its own.
I had done it anyway before posting.
Hadn't crunched RALPH for a year or so.

NOW:
after re-checking the three rigs, the strange message was gone!
Same with the RALPH project -- it was gone (removed).
I was able to add RALPH with the correct URL.

I have the impression, that I did not wait long enough.
What is long enough?
Well, the other eight rigs were more or less immediately removed from RALPH.
The other three took around 40 (!) hours to react.

And let me asure, that I did not do anything else inbetween (that what they all say).

Thanks again - you all stay healthy.