How do I copy text and send in a email?

Do you mean how do you copy a text message and send it as an email? If so, tap and hold on the message you want to copy. Tap "Copy" from the menu that pops up at the bottom of the screen. Paste into an email.

Hello.

What is your issue with copying text? Where are you trying to copy the text?

See this article for instructions on copying and pasting text:

Type and edit text on iPhone - Apple Support