When you open the Blueprint Manager, there is a large text that reads; "Blueprints", and underneath that you can see the blueprints that you have purchased.
On the column on the left side of the Blueprint Manager, you will see the various categories:
The player selects the category they want, then chooses the item in it, located in the big box right beside the categories column.
Then, the player can place the blueprint on their land.
Also, the blueprint's wood color depends on the type of wood that was (mostly) used when building it.
Note that the player should have Land first before the player can place a blueprint, and any type of Sawmill to make Planks.Previously, it was impossible to organize blueprints bought in a specific order. However, on September 26, 2016, Defaultio released a "Builder's Update".
They will be in the order in which you bought them, as well as categorized by their classification on the tabs to the left of the screen.