Seems like it's up in some places and down in others. You can always check a site on https://www.whatsmydns.net, it's pretty useful and much better than https://downforeveryoneorjustme.com, which most people use. Hop on a VPN if it's down for you in one area and you might be able to get through right now.

I still don't understand how to set the image size in this forum. Is it possible if in talkimg there is a choice of image sizes to be displayed? and this is default setting like

If you want to adjust the size, just change the height and width number. Try to choose a number that is proportional or, if you prefer, define just one of them, so that the image looks good.