Hi everyone. Newbie here. I have this little pillar here going up my house and wanted to put a climbing rose here. However, the pillar is kind of thin (about 60cm) and this long cane in the middle (that is going vertically) is not very pliable. What should I do? How should I train it? Should I give up trying to train it here because the pillar is too thin? Any help will be appreciated!

Have you a plan for how to attach it to the pillar?

Hi and welcome to the forum. A climbing rose needs to be tied or anchored some how to help it grow upwards. It won't simply grow up the wall you have without something for the stems to hold onto.
You may want to buy a pillar that is much taller than the rose to help it climb. If the stems aren't secured to 'something' climbers will often just sprawl. It might be a good idea to google how to grow climbing roses. Also, there are lots of people in here who grow climbers ( I don't ) and they can give you better info that I can.

@porkpal and @LittleAnnie, Yes! I have eye hooks and twine. I am attaching the canes using twine to the eye hooks which are placed in the cracks between the tiles in the pillar.

If a cane is growing where you don't want it to go and isn't pliable enough to direct it, prune it back to an eye on the cane that is pointing in the direction you want it to grow. The new growth in six weeks, depending on the weather and climate, will grow in that direction. You can also remove the cane if the area is getting too crowded or it has grown too out of bounds.

I think it would be necessary to place a "structure" behind the rose where you can attach or envelop the branches (climbing roses don't really climb - ie like jasmin).

If you place branches more horizontally a lot of new growth will show up. In case if this is your goal.
This is a good illustration:
https://www.thespruce.com/thmb...

US Carter, we would love to see a pic when you set up something for how you want them for the climbing rose.

USCarter - Elena is right - you will get a lot of new growth - but more importantly, and assuming it is a climbing rose and not a shrub rose, if you just let it grow upwards it will only leaf and flower at the top. Those long shoots should be encouraged (aka tied up ) as horizontally as possible. This will encourage those branches to produce lateral shoots which will grow upwards and be where it will leaf out and flower, and make the whole plant much bushier. As you have a small column you might consider winding it around the column with each turn as horizontal as possible, however if the stems are already very stiff it may be too late to do that.