Question about manual transmission on automatic?

Hi. I have an automatic car but it has d1 d2 d3 manual transmission no clutch. I used it for the first time today and from what I've learned on manual transmission, im kinda confused. Okay, d1 maxes out on 20mph and 3.5-4 rpm but if i step on the gas a lil more, theres a big push and it goes to 21-25mph and 5-6... show more Hi. I have an automatic car but it has d1 d2 d3 manual transmission no clutch. I used it for the first time today and from what I've learned on manual transmission, im kinda confused. Okay, d1 maxes out on 20mph and 3.5-4 rpm but if i step on the gas a lil more, theres a big push and it goes to 21-25mph and 5-6 rpm. Then I switch it there to d2 and I floor it until 3.5-4rpm and theres no push after just revving so then i switch too d3 which maxes out on 60mph. So, is it okay if i go up to 5-6rpm on d1? Also, is it okay if i go from d3 to D(automatic). Finally, when i decrease speed is it okay to switch back down to d1? Thanks for info guys ;D
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