If the object is intended to be 3D printed, there is no need for texture. If the object will be used digitally, texture may be needed to keep the color intact.

Select texture on the left toolbar.
Hit CTRL and select all of the scans that appear in the left panel.
Adjust any of the texture settings as needed.
Select apply, and it will add it to the mesh.

Texture panel with texture size highlighted

Higher quality - Better for historic preservation and art. Use the 16384 x 16384 texture size. This will be 100's megabits large, and will take a long time to load. This is a lot of information for a program to host on a website - so let the patron know this ahead of time.
Medium quality - Better for educational purposes, like for a museum with an audience that does not need high detail. Use the 4096 x 4096 texture size, this is the recommended setting for most objects. This is close to 8 megabits, and will be quicker to load and has less information for a hosting website.

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