how can i copy and paste a text into a keynote slide.

1 - copy the text from the source (web page, text document etc) using one of these options:

using the mouse, select the text to be used then

• in the applications menu go to; edit > copy
• right click the mouse and select copy
• keyboard command using; command C

2 - paste the text into Keynote using one of these options:

click on the slide to be used then

• in the applications menu go to; edit > paste
• right click the mouse and select paste
• keyboard command using; command V

3 - format the text on the slide for; font, size, colour, and position