I happen to still have my copy of Shorter Christian Prayer, so I can tell you what to do for Evening Prayer today.
This Sunday is the seventh in Ordinary Time. So go to the Proper for that Sunday, which is on page 509. Notice the red words immediately below the title “Seventh Sunday in Ordinary Time”; they say “Psalter, Week III.” That’s how you know where you should be in the 4-week Psalter; in other words, you need to be on page 187.
On page 187 you’ll notice it says “Sunday: Evening Prayer I.” The reason is because the celebration of all Sundays begins with Evening Prayer of the night before (so that means Saturdays do not have their own Evening Prayer).
You start, of course, by saying “God, come to my assistance. Lord, make haste to help me. Glory to the Father, and to the Son, and to the Holy Spirit. As it was in the beginning, is now, and will be forever. Amen. Alleluia.”
The hymn for tonight is your choice of either no. 32 (page 595) or no. 184 (page 663).
Now go back to page 187 and say the antiphon for the first psalm, “From the rising of the sun…” and continue on to recite the psalm, “Praise, O servants of the Lord…” When you’re finished with the psalm, say the Glory to the Father. Next recite the antiphon for the second psalm, “I shall take into my hand…,” then the psalm, “I trusted, even when I said…,” and the Glory to the Father. Finally, recite the antiphon for the third psalm, “The Lord Jesus humbled…,” then the canticle, “Though He was in the form of God…,” and the Glory to the Father.
Read the reading and then recite the responsory.
Go to page 509 and recite the antiphon for the Canticle of Mary for Evening Prayer I, “If you want to be true children…” Then recite the Canticle of Mary followed by the Glory to the Father. The Canticle is on the inside of the back cover.
Return to page 191 and pray the intercessions. Recite the Our Father (without the concluding “Amen,” just as we do at Mass).
Recite the concluding prayer for the Seventh Sunday in Ordinary Time on page 509.
Finally, say, “May the Lord bless us, protect us from all evil, and bring us to everlasting life. Amen.”
I do hope this helps,