#what_to_do_if_you_missed_prayer

👉 If you missed any prayer of the day.. pray it before you pray the present prayer ...

As an example...
If you missed Zuhur... 
And now time of Asr prayer ... So, pray Zuhur first then, Asr prayer...

👉 But if you will miss Asr prayer in the time, if you pray Zuhur first...  (As if there's only enough time for Asr prayer only... Then the time of prayer will be out)
So pray Asr first, then Zuhur...

🛑Making up a missed prayer. And it is recommended to hasten to make it up:
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👉Qatada narrated on the authority of Anas b. Malik that the Messenger of Allah (ﷺ) said:

🌀 *He who forgets the prayer, or he slept (and it was omitted), its expiation is (only) that he should observe it when he remembers it.*

(Sahih Muslim )