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Our service books are full of paragraphs headed by a Greek or Russian word & the number of a tone. This means that this hymn is intended to be sung in the indicated tone. There are basically four categories of tone for use:
Prokeimenon,
Troparion,
Irmos(sometimes spelled Heirmos or Eirmos),
& Stichera AKA samoglas AKA idiomelon.

Most of the movable parts of the services should be sung with the pertinent melody. For paragraphs whose title is one of these four names the choice is obvious.

If it is called:
Troparion, Kontakion, "God is the Lord", or Hypakoe,  then you use the Troparion melody .

If it is called:
Photogogicon, "Hymn of Light" or Exapostilarion, then you use the Troparion melody (if no tone number is indicated then either read it or sing it in tropar tone 3).

If it is a weekday during a fast & it says to sing alleluia, you sing alleluia three times with the prokim melody

Everything else can be sung with the Stichera melody. There are always exceptions, the most prominent is that the troparia of canons should be read & not sung.(except at Pascha when they are sung with the irmos melody)

Below is a handy lookup chart to bring up relevant model melody as sung at St. Sava.  On the top is the tone number. On the left is the category of tune

1 2 3 4 5 6 7 8
Troparia T1 T2 T3 T4 T5 T6 T7 T8
Prokeimenon P1 P2 P3 P4 P5 P6 P7 P8
Irmos I1 I2 I3 I4 I5 I6 I7 I8
Stichera S1 S2 S3 S4 S5 S6 S7 S8

On this page there is a very helpful glossary explaining this terminology.