Using a compositor in Blender video editing

How can I use a compositor for the video editing in Blender and not just 3d modeling?

Add workspace (+ at top right) → Video Editing → Video Editing
or
File → New → VideoEditing

…in Sequencer (lower part): Add → Movie and for the video rendereing set output path as usual in Output Properties.

And of course See also Docs-Blender Manual: Video Editing

For a more simple step by step tutorial you may look into something like:

I might try that, but I meant the actual compositor( cuz I am trying to add a glare effect to the video…)

And where is that ‘‘video rendering’’ button?
Could you please screenshot?

Usually “rendering” is refered to the action to do some drawing or painting and in the digital domain to start the process to compute the wanted result.

And in blender it’s the same as ever:

Menu → Render → Render Animation

or

Ctrl-F12

And in the compositor you add any clip via: Add → Input → Movie Clip and use any other node to add some transformation or mix it with another clip or the rendered scene…

But for non-linear video editing you have to use the video edition workspace or the video sequencer editor tab…

So there is a difference between the compositing (only for the “actual” frame) and the video editing feature ( clips are re-positionabel in time… therefor or non-linear ) .

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The compositor and the video editor in Blender are two entirely-separate tools, and this forum thread is not the proper place to try to explain the difference.