want stop when i have a certain character

[RavensFan]

Attach whatever VI you have that you say doesn't work.

[Frozen]

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@DébutanteLabVIEW wrote:

... I have to create a loop that waits for M , I have to look for the character "M" .... 

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You want to look for "M" then you need to search for it by changing your code in the red circle below. 

Frozen_0-1623859224997.png

Both  Crossrulz and GerdW already gave you the answer, so not sure how else to say it.

Good luck