Difficulty getting into 5th gear. Clutch fluid access?

Do a google search for "vauxhall clutch fluid reservoir" when you get results, filter your search so you just get results with images. (There will be a choice of results e.g. "web, images, videos... etc). You should see lots of photos of the engine compartment of vauxhall cars with the fluid reservoir shown.

Depending on your model of vauxhall, the clutch fluid reservoir (the place where you put the fluid you bought), will be located somewhere in the engine compartment. It will likely be a white plastic container with a black screw top lid. (Sometime on the lid it will say "clutch fluid" or similar thing).

Remove the lid and pour in fluid until it reaches the "max" level marked on the side of the reservoir. (It can be difficult to see the mark sometimes).

Sometimes the reservoir is located in the back of the engine compartment and there is no room to tip a bottle to pour the fluid into the reservoir. In that case, you may have to get hold of a syringe (maybe 30ml or 40ml e.g.. Find on ebay for £1 or so). Maybe have to fit a short tube on the end of the syringe to reach the reservoir. (It's like this on a vauxhall zafira for example).

There are a few fluid reservoirs in the engine compartment. e.g. there will be a reservoir for steering fluid and another reservoir for window washer fluid etc. Make sure you identify the correct reservoir before you put fluid in.