I way that I've discovered, that is easiest for me...... put the blade between the rollers/bearings FIRST......then keeping a bit of tension on the blade...to keep it between the rollers/bearings......get the blade onto the wheels/tires.
If this is your first go round with a porta-band, a couple of tips.....
1. Don't try to "horse" it when cutting.....let the blade do the work.
2. Blades: I'd recommend staying away for skip or combo tooth blades....examples: 10-14, 14-18, etc. Stick with a single size tooth blade....otherwise, at some point (usually when a blade is new and not "broken in" yet) YOU WILL break off the larger teeth.....even a couple torn off makes cutting a nightmare.....and once you break off one tooth.....others follow quickly. Personally, 18 TPI (teeth per inch) blades are the coarsest I will use..... I also keep 24 TPI blade around for cutting thinner Titanium.
If you haven't done so yet....either buy or build yourself a stand, and a "table" for it.....makes all the difference in the world......
In the above image, you can see the plug going to a switched plug in..... I zip tied the trigger down, so that switch on the silver box is what turns it on/off. Soon, that is going to be replaced with a foot switch..... Harbor Freight has them for $14...... at that price, if it burns out, no worries....provided it doesn't take the saw with it!
Aluminum table that I built for the saw.
Here you can see most of the stand I built. Being lazy, at first I actually purchased one of the SWAG Offroad stands, and was VERY dissapointed in it.....way too light gauge, and way too flimsy.......so I sucked it up and built one you could drive a truck over.
Here's the other side.....you can seen how I removed the handle on the saw, and used those holes to mount it to the stand. You can also see the zip tie holding down the trigger/switch.
Although I love these little saws, they have what I consider a MAJOR drawback.....that being the "throat". Mine is 4 1/2" from the back of the blade to the body of the saw....... it's very difficult to make any cut longer then 4" EFFICIENTLY..... any cut longer means you either have to flip the work piece over (and hope you remembered to mark your pattern on both sides!)
......or make a bunch of relief cuts.
ONE FINAL NOTE ON BLADES! THEY ARE THE HEART AND SOUL OF THESE SAWS.....BUY/USE GOOD QUALITY BLADES! Personally, I found an outfit on Ebay, I believe out of Florida, who sells, 8% cobalt blades.....and they are AWESOME!
His prices are great too. I usually buy in quantities of 25 or 50......and it works out to less then $3 per blade.......versus going to Home Depot or Lowes....which are the bottom of the barrel blades as far as quality goes, and they sell you a 3 pak for $16-$17........ $5.50 or more PER BLADE. So do yourself a favor and look around on ebay, for 44 7/8" 8% cobalt blades".