How can I have both English and Hebrew text written correctly in InDesign?

So you didn't install it yet? Your screen shot shows you at step 4 on this page. https://helpx.adobe.com/indesign/kb/access-install-hebrew-arabic-indesign-illustrator-CC.html

Will you confirm that you completed steps 5, 6 & 7?

~Barb

To be clear, to access the direction buttons, it's not about changing InDesign preferences or CC preferences.

You need to install the English/Hebrew version of InDesign. You might not want to, or be ready to, but the buttons are only available in the ME versions of InDesign. They are not part of the US English (North American) version. 

Also, @devorah_9121 and @Hendy374084080dng, are you two separate users with the same issue, or one person with two Adobe IDs. I can't tell. At any rate, @Hendy374084080dng, based on your screen shot, you will need to install an ME version. 

~Barb

I have combined English and Arabic many times without problems (not too many, anyway).

Set the world composer globally, it handles both Hebrew and English.

The paragraph's alignment is determined by the basic language: right-aligned for Hebrew, left aligned for English.

The important part is to use a character style to change character direction. If you have an English text with some Arabic, create a character style for Arabic and set its character direction to right-to-left. (You need a character style anyway yo set the font.)

If each language is always a full paragraph, then it's much easier: create a separate paragraph style for both English and Arabic. But I'm guessing you mix langaueges inside paragraphs, correct?

Are you talking about both in the same paragraph?