Dear sir, I have a doubt i want to show a image or picture when i open a app like whatsapp and other apps so how can i do it in mit app inventor
I'm not sure if I understand the question... therefore please read this and provide additional information
There are several solutions. You can use Sreen2 for this. After running the app, open Screen2 in the initialization blocks. On screen2, put a picture and a timer that will count down a few seconds and after a while it will close screen2 with a "close screen" block. You can also do it with arrangements.
An example using arrangements
Do you want a splash screen at the start of your app ?
See also how to make a greeting with a transparent background.