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I too can see the top gib sticking out - at the rear of the slide, a tapered parallelogram-section piece of (usually) cast iron - there should be a screw or screws to move it in and out of the slide, it's tapered so it can only be removed one way and the screws can lock up the slide if it's adjusted too tight.
They can also break and jam in the slide, if that happens the only way out is to remove the screw and the "fat" end if it's loose, and tap the slide to unjam it (towards the thin end of the gib), you may even need to take out whatever's obstructing access to the thin end and use a very long, very thin drift to punch it towards the wider end of the space... Once the gib's out, you may be able to lift the slide off as normally the bottom of the male dovetail (on the slide) is marginally narrower than the top of the female (in the carriage).
Good luck
They can also break and jam in the slide, if that happens the only way out is to remove the screw and the "fat" end if it's loose, and tap the slide to unjam it (towards the thin end of the gib), you may even need to take out whatever's obstructing access to the thin end and use a very long, very thin drift to punch it towards the wider end of the space... Once the gib's out, you may be able to lift the slide off as normally the bottom of the male dovetail (on the slide) is marginally narrower than the top of the female (in the carriage).
Good luck