With some verbs, the difference between the past tense and present tense can be very slight and it takes careful listening. I think they actually made a good choice to mix present and past tense verbs in these sections, so that you have to listen and look carefully and not simply let your brain assume on autopilot that every verb you see in the section will be in the past tense.
The t on the noun - pénzt - is the accusative marker which shows that it is the object of the verb.
The verb kapunk is in the present tense. The verb stem is kap and we add the ending -unk, which conveys a lot of information: 1st person plural, present, indefinite conjugation.
The past tense would be kaptunk, as in Nem kaptunk pénzt.
This is not explained in the Tips & Notes - and it should be - so for now you just have to learn by the examples. It's not ideal but hopefully in the future, beyond the Beta phase, they will add more notes and instruction. In the meantime, just ask!