Unable to select the option of image for watermark

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Your screenshot indicates you've got an existing preset selected, e.g. "Naamloze voorinstelling":

I think it's likely you're tripping over the same underlying problem described in that other thread, in which the new version of LR gets confused by existing watermark presets.

Some things to try, based on what people reported in the other thread:

1. In the Export window, choose Watermark: Simple Copyright Watermark. Then choose Edit Wartermarks:

The watermark editor should then show Custom instead of an existing preset:

2. If that doesn't work, then with Watermark Style: Text selected, save a new preset.  Then select that new preset and click Watermark Style: Graphic.  

3. If that doesn't work, then rather than clicking on Graphic, just click on Image Options > Choose and select the desired PNG or JPG.  When LR is operating normally, that will automatically switch from Text to Graphic.

4. Try deleting all existing watermark presets and then restarting LR. (Before deleting them, you can save away your current presets by doing Preferences > Presets > Show All Other Presets, which will select the Lightroom settings folder. In there is the Watermarks folder, which you can save away.)

5. Try resetting LR's preferences:
https://www.lightroomqueen.com/articles-page/how-do-i-reset-lightrooms-preferences/

LR sometimes soils its preferences file, and resetting it can fix all sorts of wonky behavior. That article explains how to restore the old preferences if resetting doesn't help.