If you mean the slim red volume Shorter Christian Prayer, this is how our Benedictine oblates are introduced to praying the Liturgy of the Hours, and what we use when we pray together.
there are instructions, read the introduction, but here is the cliff notes
the heart of the LOTH is the 4 week Psalter. To find out what week you are in, look at your missal or Catholic calendar, there is also a guide to finding the proper week in your book.
We just started Advent, we are in the 2nd week of Advent, so we are in the 2nd week of the Psalter, Tuesday. The easy way is just to pray the antiphons, psalms, reading, responsories, and interscessions as given for each day, morning and evening. It is perfectly okay to do this for a while until you get comfortable with it. This is how the church prays in ordinary time. The gospel canticles from Luke for morning and evening are on the inside covers of your book. You say the antiphon before and after, and the Glory be to the Father after each psalm.
Now find the section for Proper of the Seasons. You will see there is a section for Advent, for Christmas, Epiphany and the other liturgical feasts and seasons. You pray those sections during the appropriate season. the Monday after the Baptism of the Lord we will be in ordinary time, and you will begin with Monday, Week 1 in the psalter.
Third, find the Sundays of the Year, the sundays in ordinary time. Divide by 4 to know what week you are beginning each Sunday.
Sunday is different because there is no Saturday evening prayer, you go to Evening Prayer I for Sunday (Saturday evening), then to morning prayer and evening prayer 2 on sunday itself. what changes is the antiphons, reading, response, interecessions, and antiphon for the gospel canticle. againt, you don’t have to plug in the Sunday variations until you are comfortable with the 4-week cycle.
hymns are optional if you are doing it by yourself, they are in the back.
if you skip a segement one day, just go on to the next day, don’t try to retrace your steps or repeat “missed” prayers.
for the time being, get comfortable with praying the 4 week psalter. You begin in the morning with the Invitatory antiphon and psalm 95 in the front of the book, but this is optional if you are doing this by yourself.
praying out loud, attentively, is the best way to get in the groove and keep your mind from wandering.