Which platform you are using for blog in first place? Use Image Size as suggested to downsample images. Another important aspect is optimization and file format. Use Save for Web or Export > Export As dialogue to export in JPEG file format with quality 50-60%. Test things with quality slider while watching on image in 100% view (double click on Zoom toll icon which is in top left corner or click on zoom percentage in Export As dialogue).
Assuming this is a legitimate question and not some veiled attempt to promote your websites, optimize images for the web BEFORE you upload them to your site. In Photoshop CC, go to File > Export > Export As and select JPG. Reducing height, width & quality also reduces file size which in turn leads to faster loading pages. Ideally, web images should be below 1 MB. Under 500 KB is preferred. See screenshot.