To load a file you can either use Control I or click on the cube with a plus sign, you should then be prompted to load a file
If you load several files make certain you arrange them correctly (if you just type A on the keyboard the slicer will do it for you)
Try to rotate the file using the sidebar to the left. Try rotating the file to minimize the use of supports an/or stability while printing
The Prusa Printers have been thoroughly tested to have perfect tests for printing. To choose the correct settings follow these steps
Choose the correct printer
Choose the correct Material!!!!!!!!
This is one of the most important steps. Check the printer your using, check the filament roll, make certain you are using the right material in the settings. Not doing this can break the printer
Choose the quality.
There is almost no reason to use the ultradetail settings, they take too long. 0.20mm Quality or 0.20mm Speed should be good for most prints
Determine whether the print needs supports.
If you are not certain whether a print need supports or not, give it supports. A printer can print most things at a 45 degree angle
Determine infill
Most prints only need 15% infill, but if a print needs to be really strong, 50-70% infill should help. If it needs to be insanely strong use 100% infill
Brim
Is only necessary if the print has a small base, you really shouldn't need it
Slicing the file and exporting it
Hit Slice Now and then export it
A. Typing A will arrange all the models on the build plate