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Yes, it can be done. The best time to move the snowball bush is in early fall or in early spring, before it's begun producing leaves. Water the plant about 12-24 hours before transplanting, and try to choose a day that's not too hot or sunny for the move. After you dig it up, plant the shrub in its new location as soon as possible. Follow the advice in this article to prevent damage to the roots as much as possible:

https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

50 percent of your 'soil' should be compost.
50 percent can be coconut coir, peat moss, or sphagnum moss.
Part 2 is the fertilizer or food for the plants.
1 bag of worm castings for each 3 x 8 raised bed.
Here are a few links with more information.

https://www.gardeningknowhow.com/edible/vegetables/vgen/raised-vegetable-gardens.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm

First, a soil test is an excellent way to start!
Your County Extension Office will do a soil test for a few dollars.
This is the starting point and save time and money in prepping your garden beds for the growing season.

Here is a link to locate your nearest office.
https://www.gardeningknowhow.com/extension-search/

Here are some links on soil amendments and the best soils for vegetable beds.

https://www.gardeningknowhow.com/edible/vegetables/vgen/raised-vegetable-gardens.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/best-soil-raised-garden-beds.htm
https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-garden-soil.htm

There are several ways to go about filling the beds with soil. The links below will help you.
Plastic would not be necessary when using cedar as it is naturally resistant to rot, but there would be no harm in doing so. Do not line the bottom.

http://www.gardeninginraisedbeds.com/raised-bed-soil-mix/the-perfect-soil-mixture-for-filling-your-raised-bed/
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/best-soil-raised-garden-beds.htm

Yes, the product you used is considered to be an organic amendment to your garden soil. It is likely very rich in nitrogen which is most likely the reason for your yellowing plants. Too much nitrogen can also lead to lush plants but no vegetables forming.
I do want to say, your raised beds look great! Don't get frustrated, you can leave the garden as is and see how it goes. I would suggest working in some Bone Meal, which is phosphorous and will help balance out the nitrogen.
The other option is lift your plants, work in top soil and replant.
Try not to get frustrated as even an experienced gardener has issues each season!

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/best-soil-raised-garden-beds.htm

I would take the information and a picture of the raised bed structure to your local hardware or home improvement center. They should be able to help you with the missing piece from your purchase.