I search for a way to add a north arrow to the project frame (and not in the composer frame- that i know how to do), in the blue mark place:
[GIS] How to add north arrow to the project frame in QGIS
north-arrowqgisqgis-2.12
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The north arrow is added as an image. The behaviour of the scale depends on the CRS of your data/map.
Once you start inserting an image in the composer, you should get the option to select from a library of icons, and a subfolder is arrows, of which there are are many types. Once the image is installed, there is an option to keep the rotation of the arrow synchonised with the map.
It seems the scale problem you mention is like it is set to 1:1. This is not the default AFAIK. I almost always work in a UTM (metres) CRS for the main mapping pane (the canvas) and so the addition of the scale bar is trouble fee. If you are working with degrees your mileage may vary. Keep working with that tool.
A simplistic answer, hope its a start.
There's an option under Item Properties to do this, but it's only available for an Image item, not an Arrow, which may be why you're not seeing it. You need to add your north arrow from an image (Layout -> Add Image). Once you do, there's a checkbox under Image rotation to sync the rotation with your map:
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Best Answer
You can add a North Arrow Decoration from the menubar:
And set the relevant options as shown (the options shown are from QGIS 2.14 which allows customisation of the Margin from edge setting):
Example: