Please tell me how to send email and whatsapp messages without Activity Starter because i am a beginner and don't know activity starter
If so, then you need to learn, check out all the useful links below,
so you can learn how to use the Activity Starter. 
Activity Starter Documentation :
http://ai2.appinventor.mit.edu/reference/other/activitystarter.html
How to Send Message with WhatsApp using Activity Starter, see here :
How to Send an Email using Activity Starter, see here :
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How you can use Whatsapp with App Inventor links https://community.appinventor.mit.edu/search?q=whatsapp
How to send eMails
An extension: https://community.appinventor.mit.edu/search?q=whatsapp
Other methods Send email with photo and with painted lines
the answer is: use an extension
To get an extension you want, you can get it on this website :
To Search for an extension on that website, you have to do this :
- Windows = Ctrl + F
- Mac = Command + F