Maybe this will work
Try this:
Oh thank you so much . I wil try ut out and let you know
What is the initialization if he global index pls ?
Create Empty List......
Thank you 
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Can u pls explain the codes to me incase of next time
What is this for ?
It didnt work, pls explain to me in wording what this group of blocks do so that i know where to make changes . Thanks
In this code , When the message received is "Leave"
It assigns the variable "index" the value of index of "number" in the "broadcast list"
Then we apply the code to remove the number from the list and in that block in the index section we give it the value of the variable "index" which has stored the index of the number in the list
So what is the initialization for the message , also create empty list ?
Whatever you have initialized it here
I didnt initialize it , it was under this block 
Do u think that is what caused the error amd do i need to initialize it ?
It still isnt working
use Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
your blocks look ok, you said, it does not work... i.e. you will have to use Do it to find out, what is going on
Taifun
My companion is not working . Any other way i can acceessthe do it ?
