Translation:This man has two wolves and a big bear.
Because impersonal verbs don't get conjugated for the respective person (as the name says), you need to "conjugate" the other verb, which happens to be an infinitive, to make it clear which person "must do" the thing. For instance "Én kell úsznom" - I must swim.
That form is formed by taking the infinitive of the verb (úszni), removing the -i (úszn-), and adding the respective possessive suffix for that person (úsznom). For the third-person forms you don't remove the -i. So the possessive-infinitive forms of úszik are:
- (én) úzsnom
- (te) úsznod
- (ő) úsznia
- (mi) úsznunk
- (ti) úsznotok
- (ők) úszniuk
I've written the forms for keres in my previous reply already.
Apparently the Wiktionary calls those forms "conjugated infinitive", which is a bit weird, since it's the definition of the infinitive that it's not finite, i.e. conjugated.