join

how to i join many join tabs eg 50 when my screen is not bigger enough

--

Do it in steps. And you knew that by pressing on the blue square you can drag more items into the join?
See for example here: JOIN block type

--

Join half in one temp variable, then join the rest to that variable. You can also right click on the join block and select inline input.

--

Look here: http://appinventor.mit.edu/explore/ai2/support/concepts/mutators.html

--

how to i join many join tabs eg 50

Put the things you want to join into a list,

run the list through a list to csv block,

then through a replace comma with empty string block.

What kind of app needs a piece of text built from 50 pieces?

--

to send a sms results with 50 or so outputs 

--

to send a sms results with 50 or so output

I haven't used sms yet, but doesn't it limit its messages to 140 (or so) characters?

Are all these 50 results only 1 or 2 characters each?

This sounds more like a Fusion Tables operation.

If you haven't done so yet, do the Pizza Party tutorial.

--

to send a sms results with 50  or so outputeg like this 

--

Do as Abraham says, put it in a list and join the output by going through the list.

List Blocks, by Sajal Dutta: List Blocks On App Inventor

Chapter 19 of the App Inventor book:
http://www.appinventor.org/bookChapters/chapter19.pdf

Displaying a list: Displaying a List

--