Take plants out of the pots, remove as much of the "wool" stuff as you can, and plant the roots in the substrate (or attach to wood, rock if it is one of those types). The latter, plants like Anubias and Java Fern, gtrow attached to objects and the rhizome should not be buried or it may rot. The rhizome is the thick "root" from which the leaves and smaller hair roots grow. Swords and crypts also develop a rhizome in time, but that can be planted in the substrate. It is only the Anubias and JF that should not.
Sword plants will "divide" by the rhizome/root, and sometimes nurseries put 2 or 3 small plants in one pot. If they spearate easily, OK. A photo of the plant root you are talking about would help.