New roses will bloom towards the light. A lot of times when climbers are (re)trained, the flowers end up with strange orientations. They quickly sort themselves out.

mad_gallica is correct. DO NOT dig up your rose and replant it. Just tie it to the trellis. If there are any canes of any appreciable length, gently tie them as horizontally as you can.

Jackie

I agree, your roses will sort themselves out and the blooms will ultimately face toward sunlight rather than toward the wall. I have an amusing example of such a thing. Years ago when my husband and I first bought our house, he planted a huge row of giant sunflowers against our fence. We were so excited for them to bloom. Well, they bloomed alright...but they all faced toward our neighbor's yard and away from ours. That was the direction of the sun. Lesson learned! lol
PS: our neighbors loved them.