<p><strong>Model:</strong> Infitary M508</p>

<p><strong>Details:</strong> The filament is stuck in the extruder preheated for PLA (the filament is PLA 1.75 white). The extruder's motor works and the filament is in the hole of the extruder (not somewhere else). I took the fan covering the motor apart, to show what is inside, so you might see it on the attached image:</p>

<p><a href="https://i.stack.imgur.com/znCxG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/znCxG.png" alt="enter image description here"></a></p>

<p>You might also see this video for details: <a href="https://www.youtube.com/watch?v=R8rYGhuYWvc" rel="noreferrer">https://www.youtube.com/watch?v=R8rYGhuYWvc</a></p>

<p>I'm able to pull the filament out, when I uncouple the motor's gear, but it doesn't go through the extruder when I push it in.</p>

<p>What can I do to fix this? Thanks!</p>

<p>P.S. It's the first start of the printer.</p>

Unfortunately you're going to have to tear the extruder head apart and clean the nozzle. There are kits like the following (found on Amazon - No affiliation):
This will give you everything you need to clear the nozzle. The only other solution is to replace the nozzle and extruder tube. The filament is stuck in either or both of these parts.
(As an aside ... a wise person <
cough
> @0scar <
cough
> once told me I should keep extras of these parts, as well as the thermister and heating elements on hand. Treat them as disposable parts ... once they're dead, just replace them.)
What you need to figure out though, is why it clogged in the first place. More than likely you tried to extrude filament before the nozzle was up to temperature. If your readout said it was good, then you need to get a no-touch thermometer and check the nozzle for the proper temperature prior to printing to ensure it's all good.